636results about "Hydroxy compound separation/purification" patented technology

The invention relates to the technical field of chemical engineering, in particular to a method and a device for removing heavy components from cyclohexanol. Comprising the following steps: a, rectifying a cyclohexanol-containing material from a cyclohexene hydration reaction to obtain a first solution containing cyclohexanol and heavy components in a tower kettle; b, carrying out heavy component removal operation on the first solution to obtain a third solution containing a catalyst and heavy components, a first gas phase and a second gas phase; and c, rectifying the first gas phase and the second gas phase to obtain a fourth solution subjected to heavy component removal, namely cyclohexanol subjected to heavy component removal. The entrained catalyst and heavy components are removed together, and the fluidity required by the catalyst waste liquid is maintained by using the heavy components, so that the loss of cyclohexanol is reduced.

A gas separation method includes supplying a mixed gas to a zeolite membrane complex and permeating a high permeability gas through the zeolite membrane complex to separate the high permeability gas from other gases. The mixed gas includes a high permeability gas and a trace gas that is lower in concentration than the high permeability gas. The molar concentration of a first gas included in the trace gas in the mixed gas is higher than the molar concentration of a second gas included in the trace gas in the mixed gas. The adsorption equilibrium constant of the first gas on the zeolite membrane is less than 60 times that of the high permeability gas. The adsorption equilibrium constant of the second gas on the zeolite membrane is 400 times or more that of the high permeability gas.

This invention discloses a system and method for producing methanol by carbon dioxide hydrogenation. The system includes a feedstock turbine compressor, a first feedstock gas heat exchanger, a second feedstock gas heat exchanger, an adiabatic reactor, an isothermal reactor, a gas-liquid membrane separator, and a molecular sieve. By setting up an isothermal reactor and utilizing the heat from the product produced by the adiabatic reactor in separate streams, heat coupling between the two reactors is achieved. The unreacted feedstock gas remaining after the adiabatic first-stage reaction is circulated in the isothermal reactor, reducing the size requirements of the adiabatic reactor and improving the overall conversion rate of carbon dioxide. This application solves the problems of high energy consumption in the distillation of by-product water in the carbon dioxide hydrogenation to methanol process, large investment in traditional equipment, serious heat loss, and excessive circulating gas volume in existing technologies.

According to the method, industrial-grade 1, 2-propylene glycol co-produced by a dimethyl carbonate process through a transesterification method is taken as a raw material, and purification processes of activated carbon adsorption impurity removal, deodorant impurity removal and rectification impurity removal are carried out, so that various indexes such as chromaticity, odor, purity and ultraviolet light transmittance of the obtained 1, 2-propylene glycol product reach the quality indexes of an imported pharmaceutical-grade 1, 2-propylene glycol product. According to the method disclosed by the invention, the pharmaceutical grade propylene glycol can be prepared with high quality, and a good development prospect and huge economic benefits are undoubtedly brought to the propylene glycol industry.

The invention belongs to the technical field of chemical production, and particularly relates to a novel process for separating pentaerythritol by a membrane method and application of the novel process. The membrane separation comprises the steps of separating sodium formate by using an ion exchange membrane and separating pentaerythritol by using a low-pressure nanofiltration membrane device. The dealdehyding liquid is separated through different membranes, and formic acid, pentaerythritol, dipentaerythritol and other substances can be effectively separated. The process greatly shortens the process flow and saves the cost. According to the technical scheme, the quality and performance of the pentaerythritol product are remarkably improved, the added value of the product is increased, and a new technical scheme is provided for industrial production of pentaerythritol.

The invention relates to a separation and purification method of a high-carbon alcohol crude product. The method comprises the following steps: (a) washing a C11-C17 high-carbon alcohol crude product solution; (b) distilling the washed solution to remove heavy components; (c) mixing the de-heavy solution with an ionic liquid, adding a polar solvent into the mixture for extraction, and separating out inert components; and (d) distilling to remove light components in the high-carbon alcohol to obtain the high-carbon alcohol with the purity of more than 98.5 wt%. The method is mild in process, green in process and high in separation efficiency, product loss in the high-temperature cooking process is avoided, compared with a traditional high-carbon alcohol rectification process, energy consumption is lower, and the ionic liquid and the extraction agent can be recycled.

The invention relates to a device and a method for preparing isobutene and methanol by cracking methyl tert-butyl ether. The device comprises a methyl tert-butyl ether vaporization refining tower, a reactor, a cooling tower, an absorption tower, a methanol extraction tower, an isobutene light component removal tower and an isobutene heavy component removal tower which are sequentially connected along a material conveying direction, a top discharge hole of the cooling tower is connected with a lower gas-phase material inlet of the absorption tower; an absorbent outlet at the bottom of the absorption tower is circularly connected with a cooling absorption liquid inlet at the top of the cooling tower; the bottom extract liquor outlet of the methanol extraction tower is circularly connected with the top absorbent inlet of the absorption tower; an isobutylene discharge hole is formed in the top of the isobutylene heavy component removal tower; the device further comprises a methanol recovery tower and a methanol refining tower which are connected in sequence along the material conveying direction; a bottom cooling absorption liquid outlet of the cooling tower is connected with the methanol recovery tower; a methanol discharge hole is formed in the bottom of the methanol refining tower. The device provided by the invention not only can relax the limitation of the purity of methyl tert-butyl ether in raw materials, but also can prepare high-purity isobutene and high-purity methanol at the same time.

The invention discloses N-alkylated / sulfonated benzimidazole polyaryletherketone / polyaryletherketone sulfone with controllable grafting density as well as a preparation method and application of the N-alkylated / sulfonated benzimidazole polyaryletherketone / polyaryletherketone sulfone. The preparation method comprises the following steps: firstly, introducing a protecting group on a phenolic hydroxyl group of a bisphenol monomer containing a benzimidazole structure, then carrying out nucleophilic substitution reaction on alkyl halide / alkyl halide sulfonic acid and-NH, and then removing the protecting group to obtain an N-alkylated / sulfonated benzimidazole functionalized bisphenol monomer; copolymerizing the monomer, a bisphenol monomer and a difluoro monomer to obtain a polymer; alkyl or alkyl sulfonic acid is introduced to a benzimidazole ring, so that-NH bonds are passivated, a steric hindrance effect is formed, and gelation of the polymer under a high polymerization degree is avoided; by adjusting the molar ratio of the monomers, the retention stability of the functional groups can be effectively controlled, and compared with the traditional grafting on the polymer, the non-regulation of functionalization and the gelation of the polymer are effectively avoided.

This invention belongs to the technical field of medicinal chemistry, specifically relating to a novel crystal form of cariprazine, specifically the cariprazine-4-hydroxybenzoic acid-methanol-hemihydrate crystal form and its preparation method. The novel cariprazine-fumaric acid crystal form provided by this invention comprises a basic unit of one molecule of cariprazine, one molecule of 4-hydroxybenzoic acid, one molecule of methanol, and 0.5 molecules of water. Its preparation method is simple to operate, the crystallization process is easy to control, and it has good reproducibility. The formation of a eutectic significantly enhances the solubility of cariprazine, exhibiting strong pharmaceutical value.

This application discloses an integrated method and system for the co-production of MTO methanol and refined methanol, belonging to the field of chemical technology. The co-production method provided by this application includes: feeding crude methanol into a light-duty removal distillation column for pre-distillation treatment to obtain a pre-distillation column bottom component; dividing the pre-distillation column bottom component into two streams, one as the output of MTO methanol and the other as a reprocessed component of the pre-distillation column bottom; feeding the reprocessed component of the pre-distillation column bottom into a refined methanol distillation column for distillation treatment to obtain a distillation column top component and a distillation column bottom component; at least a portion of the distillation column top component is output as refined methanol, and the distillation column bottom component is returned to the light-duty removal distillation column. This application achieves the co-production of refined methanol using only two columns, eliminating the need for additional independent equipment, significantly reducing equipment investment costs, and enabling flexible adjustment of both MTO methanol and refined methanol products, thus possessing broad application prospects in the industrial-grade MTO methanol field.

The application belongs to the technical field of microorganisms and particularly relates to a kind of Aspergillus ustus and application thereof.The Aspergillus ustus is preserved in China General Microbiological Culture Collection Center, and the preservation number is CGMCC No.40820.The Aspergillus ustus can be separated to obtain sesquiterpenes shown in formula I and formula II, and the sesquiterpenes have good bacteriostatic activity on Physarum polycephalum, and the bacteriostatic rates are 79.45% and 76.71% respectively at a final concentration of 100 μg / mL, which is equivalent to the control agent of bercyn in inhibiting mycelial growth.

The application relates to a preparation method and application of a silicone / MOF-303 mixed matrix membrane. A silicon source precursor is uniformly dissolved in an ethanol solvent, a mixture of water and hydrochloric acid is added in a certain proportion, water bath heating is carried out for a period of time, and a silicone sol is obtained. MOF-303 powder prepared in advance is added into the silicone sol in a certain proportion, ultrasonic mixing is carried out to obtain a separation layer sol, the prepared separation layer sol is coated on a ceramic support through a hot coating method, and calcination is carried out in an air atmosphere for a period of time to obtain a MOF-303 / mixed matrix membrane. The application preferably uses an organic silicone substance BTESA with a rigid acetylene bridge structure as a precursor, and the MOF-303 material with a high specific surface area is doped into the precursor, the pore structure of the membrane is modified, and more adsorption sites are provided for water molecules. Through optimization of the composite proportion, a composite membrane material with the best separation performance is obtained.

The utility model relates to the technical field of alcohol extraction, in particular to a secondary alcohol cooling and extracting system which comprises an evaporating tank and a collecting tank, the evaporating tank is connected with the collecting tank through a cooling and extracting device, the cooling and extracting device comprises a condenser, and the condenser is fixedly connected to the top of the evaporating tank through a supporting component; wherein the supporting component comprises a first supporting part and a second supporting part, and the first supporting part and the second supporting part are used in a telescopic mode through an adjusting assembly; a fixing assembly is arranged on the top of the second supporting part and used for fixing the condenser, the condenser can be conveniently adjusted and installed through an adjusting assembly, the condenser is limited and supported through an annular part, then a connecting belt is pulled to abut against the condenser, and after the connecting belt and a clamping rod are fixed, the effect of conveniently installing the condenser is achieved. The condenser is convenient to disassemble and assemble, and meanwhile the downtime can be effectively shortened.

The invention discloses a treatment technology for separating a sorbic acid isomerization product, and belongs to the field of chemical engineering. According to the method, water and ethanol in the eliminated mother liquor are separated through selective separation of the dehydration membrane, so that an ethanol solution with higher concentration is obtained, the concentrations of sorbic acid and isomers in the solution are increased, then the crystallization temperature is controlled by utilizing the solubility difference of the sorbic acid and the isomers in the alcohol, and the crystallization efficiency is improved. Sorbic acid containing a low isomerization product is separated and recovered, so that the quality of a finished product is effectively improved.

The present application relates to the technical field of coal-to-ethanol, and discloses a low-temperature heat combined utilization system of a coal-to-ethanol device, which comprises a heat medium storage tank, a flash steam-gray water heat exchanger, a heat medium-flash steam heat exchanger, an ethanol refining tower body, an ethanol light component removal tower body and a methanol ester removal tower body, the heat medium storage tank is connected with the heat medium-flash steam heat exchanger through a heat medium booster pump, and the flash steam-gray water heat exchanger is connected with the heat medium-flash steam heat exchanger; the ethanol refining tower body is connected with an ethanol refining tower heat medium reboiler and an ethanol refining tower steam reboiler, the ethanol light component removal tower body is connected with an ethanol light component removal tower heat medium reboiler and an ethanol light component removal tower steam reboiler, and the methanol ester removal tower body is connected with a methanol ester removal tower heat medium reboiler and a methanol ester removal tower steam reboiler; and the heat medium storage tank, the heat medium-flash steam heat exchanger, the ethanol refining tower heat medium reboiler, the ethanol light component removal tower heat medium reboiler and the methanol ester removal tower heat medium reboiler form a closed loop.

To provide a process for the separation of at least one inositol from a carob extract.SOLUTION: This process comprises the steps of: a) providing a filtered and demineralised carob extract having a Brix value greater than 60 and a pinitol content, in weight percent based on the weight of the extract, from 5 to 25%; b) subjecting the carob extract of step a) to a process of chromatographic separation of the pinitol, wherein the process comprises subjecting the extract to at least one passage through a chromatographic resin, thus obtaining an aqueous solution having a pinitol content, in weight percent based on the total weight of the solution, from 35 to 70%, and which has a Brix value of 20 or lower; and c) subjecting the aqueous solution thus obtained in step b) to a purification step, thus obtaining a purified aqueous solution having a pinitol content, in weight percent based on the total weight of the solution, of more than 55%.SELECTED DRAWING: Figure 1

This application relates to the field of organic synthesis technology, specifically disclosing a process for preparing tert-butyl vinyl ether. The raw materials include solid tert-butanol, acetylene, tetrahydrofuran solvent, and potassium hydroxide catalyst, supplemented with auxiliary materials such as type 3A molecular sieves and activated alumina adsorbents. The preparation method involves: after dehydration and purification of the raw materials, the materials are introduced into a reaction vessel; temperature and pressure are controlled, and the reaction endpoint is monitored using an infrared spectrometer; byproducts are quenched and acetylene is recovered; the process involves multi-stage condensation, water washing to remove impurities, distillation separation, and solvent purification and recycling, with simultaneous integration of waste heat recovery and continuous material feeding. The tert-butyl vinyl ether prepared by this process, as an important fine chemical intermediate, can be used in coatings, adhesives, and polymer material modification, possessing advantages such as high purity and good stability. The preparation method achieves efficient utilization of materials and energy through multi-stage synergistic linkage, combining the advantages of green environmental protection, continuous and stable operation, and high resource utilization.

The invention discloses a reflux device and method for producing aluminum sec-butoxide, relates to the technical field of preparation of organic aluminum compounds, and aims to solve the problems that near-boiling residues are difficult to separate, the reflux efficiency is low and the improvement cost is high in the existing aluminum sec-butoxide production. The device comprises a reaction unit, an adsorption-condensation integrated separation unit, a directional reflux distribution unit and a hydrogen recovery unit, and all the units are matched with existing reaction kettles. The method comprises the steps of pretreatment, reaction reflux and post-treatment. The purity of aluminum sec-butoxide is larger than or equal to 97.5%, the conversion rate of aluminum powder is larger than or equal to 90%, the cost per ton is reduced by 1500 yuan, the transformation cost is 0.28 million yuan, and the method is suitable for low-cost transformation of small and medium-sized enterprises.

The invention relates to the technical field of novel fertilizer production, and provides a device and a method for producing oxamide. Anhydrous liquid ammonia and dimethyl oxalate are used as raw materials to prepare oxamide by a liquid phase method, and an alcohol ammonia gas phase containing a small amount of ammonia gas and a large amount of methanol is generated in a gas-liquid separation process and a drying process; and an alcohol ammonia liquid phase which is generated in a solid-liquid separation process and contains trace ammonia and a large amount of methanol is washed and absorbed in an ammonia reaction absorber by adopting dimethyl oxalate, the methanol and the ammonia are separated, the methanol obtained after washing is relatively high in purity and does not need to be refined through energy-consuming and steam-consuming equipment such as a distillation tower and a rectifying tower, so that the energy consumption is reduced, and the production cost is reduced. And the production cost of oxamide is greatly reduced. Furthermore, the heat of the ammonolysis reaction is recovered by adopting the heat-conducting medium and is used for drying the oxamide powder and the like, the process is simple, the waste heat is fully utilized, and the production cost of the oxamide is further reduced.

The invention belongs to the technical field of chemical production, aims to solve the problem of catalyst deactivation caused by crystallization and wrapping in the existing hydrogenated bisphenol A (HBPA) production process, and provides a star polymer for inhibiting crystallization and wrapping in the HBPA production process as well as a preparation method and application thereof. The star polymer provided by the invention takes a polyfunctional group compound (such as pentaerythritol and diethylenetriamine) as a core, a polyacrylic acid main chain with the molecular weight of 5,000-20,000 g / mol is extended, a polyethylene glycol side chain with the molecular weight of 500-2,000 g / mol and the grafting rate of 20%-50% is grafted on the main chain, and through the hydrogen-bond interaction of a carboxylic acid group and HBPA crystals and the steric hindrance effect of the polyethylene glycol side chain, the molecular weight of the HBPA crystals is increased, so that the molecular weight of the HBPA crystals is increased, and the molecular weight of the HBPA crystals is increased. Devitrification wrapping is efficiently inhibited. The invention develops a method which is efficient and environment-friendly and does not introduce new impurities, is used for inhibiting the crystallization wrapping phenomenon in the hydrogenated bisphenol A production process, and has important industrial application value.

The present disclosure provides a preparation system and a preparation method for xylitol crystals. In the preparation system, outlets of a first centrifuge are connected with an inlet of a hot air drying tank and an inlet of a primary mother liquor storage tank through pipelines, respectively. Outlets of a second centrifuge are connected with an inlet of a second fluidized bed dryer and an inlet of a secondary mother liquor storage tank through pipelines, respectively. An outlet of a dicrystalline sugar dissolution tank is connected with an inlet of a blending tank through a pipeline. An outlet of a tricrystalline sugar dissolution tank is connected with the inlet of the primary mother liquor storage tank. The blending tank is provided with an inlet for a raw material of xylitol hydrogenation solution. An output of an outlet of a first fluidized bed dryer is prepared xylitol crystals.

A chemical synthesis apparatus comprising: one or more reactors configured to produce a process stream comprising at least one chemical product from one or more reactants; a feed preparation system configured to prepare one or more feed streams comprising one or more of one or more reactants to be introduced into one or more reactors; and / or a product purification system configured to separate at least one chemical product from reaction byproducts, unreacted reactants, or a combination thereof within the process stream, wherein the chemical synthesis apparatus is configured such that a majority of the net energy required for heating, cooling, compression, or a combination thereof used via one or more reactors, feed preparation systems, product purification systems, or a combination thereof is provided by a non-carbon-based energy source, renewable energy source, and / or electrical power.

A method for processing sugar cane juice from raw sugar cane stalks to produce various forms of a natural sugar cane juice product preserves policosanols naturally occurring in the raw sugar cane stalks, resulting in policosanol-rich natural sugar cane juice-based products such as a dry, granulated sweetener concentrate.

The invention relates to the technical field of cooling separation, in particular to a high-yield continuous production device and process for mono-pentaerythritol and dipentaerythritol, and the high-yield continuous production device for mono-pentaerythritol and dipentaerythritol comprises a crystallization barrel, a cooling tower and a liquid outlet mechanism; the crystallization barrel is communicated with the liquid inlet end of the cooling tower through a first pipeline, a feeding hole is formed in the upper end of the crystallization barrel, and a concentration sensor is arranged at the feeding hole; the liquid outlet mechanism comprises a liquid outlet pipe set and an adjusting unit, and the liquid outlet pipe set is located in the crystallization barrel and communicates with the first pipeline. When the crystallization barrel is used, a solution entering the crystallization barrel flows out of the liquid outlet pipe group to heat the liquid outlet pipe group, so that the temperature of the solution entering the liquid outlet pipe group or near the liquid outlet pipe group is increased, crystals carried by the solution near the liquid outlet pipe group are dissolved again, and the quantity of the crystals flowing out of the liquid outlet pipe group is greatly reduced. The adjusting unit adjusts the position of the liquid outlet pipe set according to the solution concentration, detected by the concentration sensor, at the feeding port, and attachment of crystals outside the liquid outlet pipe set is reduced.

The utility model discloses a hydrolysis device applied to sodium methoxide wastewater, which comprises a support, a reaction kettle arranged on the support, a feed port, a water inlet, an exhaust port and an oil discharge port sequentially arranged at the top of the reaction kettle, a discharge port arranged at the bottom of the reaction kettle, a guide rod vertically arranged in the reaction kettle, a sliding sleeve sleeved on the guide rod, and a lifting pipe arranged on the side surface of the sliding sleeve. The upper end of the lifting pipe is connected with one end of a telescopic hose, the other end of the telescopic hose is connected with an oil outlet formed in the top of the reaction kettle, a supporting plate is arranged on the side wall of the reaction kettle, a first motor is arranged on the supporting plate, and an output shaft of the first motor penetrates through the side wall of the reaction kettle and extends into the reaction kettle. One end of the pulling rope is connected with the winding drum, and the other end of the pulling rope is connected with the sliding sleeve. The device disclosed by the utility model is high in hydrolysis efficiency, and the hydrolyzed oil phase and water can be quickly separated, so that the efficient recycling of the sodium methoxide wastewater is realized.

The invention relates to a method for purifying a by-product of neomenthol in a menthol production line, which is characterized in that a reaction product obtained by hydrogenating thymol to produce menthol is used as a raw material, and the extraction of high-purity neomenthol is realized through a process of combining rectification and crystallization. The method specifically comprises the following steps: rectifying by using a rectifying tower with a specific specification under the conditions that the temperature is 115-125 DEG C, the vacuum degree is 15-20mmHg and the reflux ratio is (20: 2)-(50: 2), and enriching neomenthol to 75-77%; and carrying out plate-type crystallization treatment twice, carrying out crystallization under the conditions that the temperature is reduced to 25-27 DEG C through primary crystallization and the temperature is reduced to 35 DEG C through secondary programmed cooling, and carrying out further purification through heating and sweating to finally obtain a neomenthol product with the purity of 99.5%. The method is simple in process and low in energy consumption, does not need a solvent, can be directly connected with an existing production line, and is suitable for large-scale production of medicine and spice-grade high-purity neomenthol.

The invention discloses a preparation method of high-purity 2-fluoroethanol, and particularly relates to the technical field of preparation of 2-fluoroethanol, which comprises the following steps: S1, in a dual-catalyst system consisting of a phase transfer catalyst and a Lewis acid catalyst and an organic solvent, carrying out fluoridation reaction on 2-chloroethanol and anhydrous potassium fluoride at 60-120 DEG C for 2-10 hours to obtain 2-chloroethanol; and S2, sequentially carrying out integrated purification of filtration, reduced pressure distillation, adsorption treatment and rectification on the reaction mixture. According to the invention, through synergistic activation and mass transfer of double catalysts, the reaction rate and selectivity are significantly improved, the water segregator is utilized to remove reaction water to push equilibrium movement, the conversion rate is improved, and water and impurities are systematically removed by virtue of composite adsorption and precise rectification of molecular sieves and activated carbon, so that high-quality 2-fluoroethanol with high purity and low moisture is finally obtained. The whole preparation process is mild in condition, high in yield, good in safety and suitable for industrial production.

The application discloses a refining method of glyceryl oleate series products. The glyceryl oleate mixture is used as raw material, the mixture is melted by heating, then the melted liquid is flowed through a panel containing different temperature zones, and crystals are separated in the corresponding temperature zones by using the difference of solidification points of different components, so that glyceryl monooleate, glycerol, glyceryl dioleate and glyceryl trioleate are obtained respectively. The separation of each component in the glyceryl oleate mixture is realized. The method does not introduce solvent and adsorbent, is green and environment-friendly, and the obtained products can meet the demand of high-purity glyceryl monooleate and glyceryl dioleate for biological products.

To provide a membrane reactor capable of improving yield of a target product by progressing efficiently a catalyst reaction, in a reaction controlled by chemical equilibrium.SOLUTION: Concerning a membrane reactor for performing a reaction controlled by chemical equilibrium, the membrane reactor has a separation membrane for selectively and continuously separating, from reaction liquid, a by-product generated by the reaction. By selectively and continuously separating the by-product from the reaction liquid, the chemical equilibrium is shifted and the reaction is furthermore progressed.SELECTED DRAWING: None